On Fri, Oct 30, 2020 at 8:14 PM Strahil Nikolov <hunter86...@yahoo.com>
wrote:

> If you mean "Administration" -> "Providers" -> "Ovirt-provider-ovn" -> it
> is enabled.
>
>
Yes, this one.
If it is enabled, Engine should reflect the MTU which is provided by
ovirt-provider-ovn via OpenStack API.
The related configuration value dhcp-mtu of ovirt-provider-ovn is explained
in https://github.com/oVirt/ovirt-provider-ovn/blob/master/README.adoc.



> Best Regards,
> Strahil Nikolov
>
>
>
>
>
>
> В петък, 30 октомври 2020 г., 21:10:02 Гринуич+2, Strahil Nikolov <
> hunter86...@yahoo.com> написа:
>
>
>
>
>
> Any hint for the location of "Automatic Synchronization" in UI ?
>
> Best Regards,
> Strahil Nikolov
>
>
>
>
>
>
> В петък, 30 октомври 2020 г., 20:16:13 Гринуич+2, Dominik Holler <
> dhol...@redhat.com> написа:
>
>
>
>
>
>
>
> On Fri, Oct 30, 2020 at 7:03 PM Strahil Nikolov <hunter86...@yahoo.com>
> wrote:
> > in 4.3.10's UI it shows 1500 :)
> >
>
> This might be just a misleading representation of the default value or an
> unknown value.
> If "Automatic Synchronization" is enabled for the ovirt-provider-ovn in
> oVirt Engine,
> the value should be updated in Engine to the correct after the next
> synchronization in the background.
>
> >
> >
> >
> >
> >
> > В петък, 30 октомври 2020 г., 13:25:05 Гринуич+2, Dominik Holler <
> dhol...@redhat.com> написа:
> >
> >
> >
> >
> >
> >
> >
> > On Thu, Oct 29, 2020 at 9:36 PM Alex K <rightkickt...@gmail.com> wrote:
> >>
> >>
> >> On Tue, Oct 27, 2020, 02:49 Strahil Nikolov via Users <users@ovirt.org>
> wrote:
> >>> Hello All,
> >>>
> >>> I would like to learn more about OVN and especially the maximum MTU
> that I can use in my environment.
> >>>
> >>> Current Setup 4.3.10
> >>> Network was created via UI -> MTU Custom -> 8976 -> Create on External
> Provider -> Connect to Physical Network
> >>>
> >>> So my physical connection is MTU 9000 and I have read that Geneve uses
> 24 bits (maybe that's wrong ?) , thus I have reduced the MTU to 8976.
> >> From the internet draft it seems that the tunnel header + reserved bits
> comprise 64 bits. A common practice for Geneve implementations  is to use
> 8900 mtu for VMs when having 9000 mtu physical network.
> >>
> >
> > Ack, this is a safe choice.
> > In oVirt's default configuration, an overhead of 58 bytes
> > ( = 20 IPv4 header + 8 UDP header + 16 GENEVE Ethernet header (including
> 8 bytes options) + 14 bytes inner Ethernet header)
> > is added.
> > This is why the default MTU for OVN networks in oVirt is 1442 bytes,
> which assumes 1500 bytes MTU in the physical network.
> >
> >
> >
> >>
> >> The draft:
> >> https://tools.ietf.org/html/draft-ietf-nvo3-geneve-08
> >>>
> >>> I did some testing on the VMs and ping with payload of '8914' was the
> maximum I could pass without fragmenting and thus the MTU on the VMs was
> set to 8942.
> >>>
> >>> Did I correctly configure the test network's MTU and am I
> understanding it correctly that we need extra 34 bits inside the network
> for encapsulation ?
> >>>
> >
> > You could check with packet analyzers like tcpdump and wireshark.
> >
> >>>  I have checked
> https://www.ovirt.org/develop/release-management/features/network/managed_mtu_for_vm_networks.html
> but I don't see any refference how to calculate the max MTU.
> >>>
> >>>
> >>> Best Regards,
> >>> Strahil Nikolov
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> >
>
>
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